Ok first time asking a question here, hope it makes sense.I've been racking my brain how to do this using nintex workflows or any other option. 

I have a list that has a calculated column called 'NewSetup'. I have another lookup column in the same list called 'NewSetup_lkup'. This lookup column points to a list that has a list of values that will match to the value of the calculated column. 

I want to copy the calculated value in 'NewSetup' to the lookup column 'NewSetup_lkup' that has the same text value as 'NewSetup'.

I realize lookup columns use IDs instead of text, that's where i'm stuck. Not sure how to update a lookup value using text to match that up with the ID of the lookup list.

Any guidance/recommendations appreciated!